func performDownload(oid string, size int64, a *action, writer, errWriter *bufio.Writer) {
	// We just use the URLs we're given, so we're just a proxy for the direct method
	// but this is enough to test intermediate custom adapters
	req, err := httputil.NewHttpRequest("GET", a.Href, a.Header)
	if err != nil {
		sendTransferError(oid, 2, err.Error(), writer, errWriter)
		return
	}
	res, err := httputil.DoHttpRequest(cfg, req, true)
	if err != nil {
		sendTransferError(oid, res.StatusCode, err.Error(), writer, errWriter)
		return
	}
	defer res.Body.Close()

	dlFile, err := ioutil.TempFile("", "lfscustomdl")
	if err != nil {
		sendTransferError(oid, 3, err.Error(), writer, errWriter)
		return
	}
	defer dlFile.Close()
	dlfilename := dlFile.Name()
	// Turn callback into progress messages
	cb := func(totalSize int64, readSoFar int64, readSinceLast int) error {
		sendProgress(oid, readSoFar, readSinceLast, writer, errWriter)
		return nil
	}
	_, err = tools.CopyWithCallback(dlFile, res.Body, res.ContentLength, cb)
	if err != nil {
		sendTransferError(oid, 4, fmt.Sprintf("cannot write data to tempfile %q: %v", dlfilename, err), writer, errWriter)
		os.Remove(dlfilename)
		return
	}
	if err := dlFile.Close(); err != nil {
		sendTransferError(oid, 5, fmt.Sprintf("can't close tempfile %q: %v", dlfilename, err), writer, errWriter)
		os.Remove(dlfilename)
		return
	}

	// completed
	complete := &transferResponse{"complete", oid, dlfilename, nil}
	err = sendResponse(complete, writer, errWriter)
	if err != nil {
		writeToStderr(fmt.Sprintf("Unable to send completion message: %v\n", err), errWriter)
	}
}
func performUpload(oid string, size int64, a *action, fromPath string, writer, errWriter *bufio.Writer) {
	// We just use the URLs we're given, so we're just a proxy for the direct method
	// but this is enough to test intermediate custom adapters
	req, err := httputil.NewHttpRequest("PUT", a.Href, a.Header)
	if err != nil {
		sendTransferError(oid, 2, err.Error(), writer, errWriter)
		return
	}

	if len(req.Header.Get("Content-Type")) == 0 {
		req.Header.Set("Content-Type", "application/octet-stream")
	}

	if req.Header.Get("Transfer-Encoding") == "chunked" {
		req.TransferEncoding = []string{"chunked"}
	} else {
		req.Header.Set("Content-Length", strconv.FormatInt(size, 10))
	}

	req.ContentLength = size

	f, err := os.OpenFile(fromPath, os.O_RDONLY, 0644)
	if err != nil {
		sendTransferError(oid, 3, fmt.Sprintf("Cannot read data from %q: %v", fromPath, err), writer, errWriter)
		return
	}
	defer f.Close()

	// Turn callback into progress messages
	cb := func(totalSize int64, readSoFar int64, readSinceLast int) error {
		sendProgress(oid, readSoFar, readSinceLast, writer, errWriter)
		return nil
	}
	var reader io.Reader
	reader = &progress.CallbackReader{
		C:         cb,
		TotalSize: size,
		Reader:    f,
	}

	req.Body = ioutil.NopCloser(reader)

	res, err := httputil.DoHttpRequest(cfg, req, true)
	if err != nil {
		sendTransferError(oid, res.StatusCode, fmt.Sprintf("Error uploading data for %s: %v", oid, err), writer, errWriter)
		return
	}

	if res.StatusCode > 299 {
		sendTransferError(oid, res.StatusCode, fmt.Sprintf("Invalid status for %s: %d", httputil.TraceHttpReq(req), res.StatusCode), writer, errWriter)
		return
	}

	io.Copy(ioutil.Discard, res.Body)
	res.Body.Close()

	// completed
	complete := &transferResponse{"complete", oid, "", nil}
	err = sendResponse(complete, writer, errWriter)
	if err != nil {
		writeToStderr(fmt.Sprintf("Unable to send completion message: %v\n", err), errWriter)
	}

}
func (a *basicUploadAdapter) DoTransfer(t *Transfer, cb TransferProgressCallback, authOkFunc func()) error {
	rel, ok := t.Object.Rel("upload")
	if !ok {
		return fmt.Errorf("No upload action for this object.")
	}

	req, err := httputil.NewHttpRequest("PUT", rel.Href, rel.Header)
	if err != nil {
		return err
	}

	if len(req.Header.Get("Content-Type")) == 0 {
		req.Header.Set("Content-Type", "application/octet-stream")
	}

	if req.Header.Get("Transfer-Encoding") == "chunked" {
		req.TransferEncoding = []string{"chunked"}
	} else {
		req.Header.Set("Content-Length", strconv.FormatInt(t.Object.Size, 10))
	}

	req.ContentLength = t.Object.Size

	f, err := os.OpenFile(t.Path, os.O_RDONLY, 0644)
	if err != nil {
		return errutil.Error(err)
	}
	defer f.Close()

	// Ensure progress callbacks made while uploading
	// Wrap callback to give name context
	ccb := func(totalSize int64, readSoFar int64, readSinceLast int) error {
		if cb != nil {
			return cb(t.Name, totalSize, readSoFar, readSinceLast)
		}
		return nil
	}
	var reader io.Reader
	reader = &progress.CallbackReader{
		C:         ccb,
		TotalSize: t.Object.Size,
		Reader:    f,
	}

	// Signal auth was ok on first read; this frees up other workers to start
	if authOkFunc != nil {
		reader = newStartCallbackReader(reader, func(*startCallbackReader) {
			authOkFunc()
		})
	}

	req.Body = ioutil.NopCloser(reader)

	res, err := httputil.DoHttpRequest(req, true)
	if err != nil {
		return errutil.NewRetriableError(err)
	}
	httputil.LogTransfer("lfs.data.upload", res)

	// A status code of 403 likely means that an authentication token for the
	// upload has expired. This can be safely retried.
	if res.StatusCode == 403 {
		return errutil.NewRetriableError(err)
	}

	if res.StatusCode > 299 {
		return errutil.Errorf(nil, "Invalid status for %s: %d", httputil.TraceHttpReq(req), res.StatusCode)
	}

	io.Copy(ioutil.Discard, res.Body)
	res.Body.Close()

	return api.VerifyUpload(t.Object)
}
// download starts or resumes and download. Always closes dlFile if non-nil
func (a *basicDownloadAdapter) download(t *Transfer, cb TransferProgressCallback, authOkFunc func(), dlFile *os.File, fromByte int64, hash hash.Hash) error {

	if dlFile != nil {
		// ensure we always close dlFile. Note that this does not conflict with the
		// early close below, as close is idempotent.
		defer dlFile.Close()
	}

	rel, ok := t.Object.Rel("download")
	if !ok {
		return errors.New("Object not found on the server.")
	}

	req, err := httputil.NewHttpRequest("GET", rel.Href, rel.Header)
	if err != nil {
		return err
	}

	if fromByte > 0 {
		if dlFile == nil || hash == nil {
			return fmt.Errorf("Cannot restart %v from %d without a file & hash", t.Object.Oid, fromByte)
		}
		// We could just use a start byte, but since we know the length be specific
		req.Header.Set("Range", fmt.Sprintf("bytes=%d-%d", fromByte, t.Object.Size-1))
	}

	res, err := httputil.DoHttpRequest(req, true)
	if err != nil {
		// Special-case status code 416 () - fall back
		if fromByte > 0 && dlFile != nil && res.StatusCode == 416 {
			tracerx.Printf("xfer: server rejected resume download request for %q from byte %d; re-downloading from start", t.Object.Oid, fromByte)
			dlFile.Close()
			os.Remove(dlFile.Name())
			return a.download(t, cb, authOkFunc, nil, 0, nil)
		}
		return errutil.NewRetriableError(err)
	}
	httputil.LogTransfer("lfs.data.download", res)
	defer res.Body.Close()

	// Range request must return 206 & content range to confirm
	if fromByte > 0 {
		rangeRequestOk := false
		var failReason string
		// check 206 and Content-Range, fall back if either not as expected
		if res.StatusCode == 206 {
			// Probably a successful range request, check Content-Range
			if rangeHdr := res.Header.Get("Content-Range"); rangeHdr != "" {
				regex := regexp.MustCompile(`bytes (\d+)\-.*`)
				match := regex.FindStringSubmatch(rangeHdr)
				if match != nil && len(match) > 1 {
					contentStart, _ := strconv.ParseInt(match[1], 10, 64)
					if contentStart == fromByte {
						rangeRequestOk = true
					} else {
						failReason = fmt.Sprintf("Content-Range start byte incorrect: %s expected %d", match[1], fromByte)
					}
				} else {
					failReason = fmt.Sprintf("badly formatted Content-Range header: %q", rangeHdr)
				}
			} else {
				failReason = "missing Content-Range header in response"
			}
		} else {
			failReason = fmt.Sprintf("expected status code 206, received %d", res.StatusCode)
		}
		if rangeRequestOk {
			tracerx.Printf("xfer: server accepted resume download request: %q from byte %d", t.Object.Oid, fromByte)
			// Advance progress callback; must split into max int sizes though
			if cb != nil {
				const maxInt = int(^uint(0) >> 1)
				for read := int64(0); read < fromByte; {
					remainder := fromByte - read
					if remainder > int64(maxInt) {
						read += int64(maxInt)
						cb(t.Name, t.Object.Size, read, maxInt)
					} else {
						read += remainder
						cb(t.Name, t.Object.Size, read, int(remainder))
					}

				}
			}
		} else {
			// Abort resume, perform regular download
			tracerx.Printf("xfer: failed to resume download for %q from byte %d: %s. Re-downloading from start", t.Object.Oid, fromByte, failReason)
			dlFile.Close()
			os.Remove(dlFile.Name())
			if res.StatusCode == 200 {
				// If status code was 200 then server just ignored Range header and
				// sent everything. Don't re-request, use this one from byte 0
				dlFile = nil
				fromByte = 0
				hash = nil
			} else {
				// re-request needed
				return a.download(t, cb, authOkFunc, nil, 0, nil)
			}
		}
	}

	// Signal auth OK on success response, before starting download to free up
	// other workers immediately
	if authOkFunc != nil {
		authOkFunc()
	}

	var hasher *tools.HashingReader
	if fromByte > 0 && hash != nil {
		// pre-load hashing reader with previous content
		hasher = tools.NewHashingReaderPreloadHash(res.Body, hash)
	} else {
		hasher = tools.NewHashingReader(res.Body)
	}

	if dlFile == nil {
		// New file start
		dlFile, err = os.OpenFile(a.downloadFilename(t), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
		if err != nil {
			return err
		}
		defer dlFile.Close()
	}
	dlfilename := dlFile.Name()
	// Wrap callback to give name context
	ccb := func(totalSize int64, readSoFar int64, readSinceLast int) error {
		if cb != nil {
			return cb(t.Name, totalSize, readSoFar+fromByte, readSinceLast)
		}
		return nil
	}
	written, err := tools.CopyWithCallback(dlFile, hasher, res.ContentLength, ccb)
	if err != nil {
		return fmt.Errorf("cannot write data to tempfile %q: %v", dlfilename, err)
	}
	if err := dlFile.Close(); err != nil {
		return fmt.Errorf("can't close tempfile %q: %v", dlfilename, err)
	}

	if actual := hasher.Hash(); actual != t.Object.Oid {
		return fmt.Errorf("Expected OID %s, got %s after %d bytes written", t.Object.Oid, actual, written)
	}

	return tools.RenameFileCopyPermissions(dlfilename, t.Path)

}
Exemple #5
0
func (a *tusUploadAdapter) DoTransfer(ctx interface{}, t *Transfer, cb TransferProgressCallback, authOkFunc func()) error {
	rel, ok := t.Object.Rel("upload")
	if !ok {
		return fmt.Errorf("No upload action for this object.")
	}

	// Note not supporting the Creation extension since the batch API generates URLs
	// Also not supporting Concatenation to support parallel uploads of chunks; forward only

	// 1. Send HEAD request to determine upload start point
	//    Request must include Tus-Resumable header (version)
	tracerx.Printf("xfer: sending tus.io HEAD request for %q", t.Object.Oid)
	req, err := httputil.NewHttpRequest("HEAD", rel.Href, rel.Header)
	if err != nil {
		return err
	}
	req.Header.Set("Tus-Resumable", TusVersion)
	res, err := httputil.DoHttpRequest(config.Config, req, false)
	if err != nil {
		return errors.NewRetriableError(err)
	}

	//    Response will contain Upload-Offset if supported
	offHdr := res.Header.Get("Upload-Offset")
	if len(offHdr) == 0 {
		return fmt.Errorf("Missing Upload-Offset header from tus.io HEAD response at %q, contact server admin", rel.Href)
	}
	offset, err := strconv.ParseInt(offHdr, 10, 64)
	if err != nil || offset < 0 {
		return fmt.Errorf("Invalid Upload-Offset value %q in response from tus.io HEAD at %q, contact server admin", offHdr, rel.Href)
	}
	// Upload-Offset=size means already completed (skip)
	// Batch API will probably already detect this, but handle just in case
	if offset >= t.Object.Size {
		tracerx.Printf("xfer: tus.io HEAD offset %d indicates %q is already fully uploaded, skipping", offset, t.Object.Oid)
		advanceCallbackProgress(cb, t, t.Object.Size)
		return nil
	}

	// Open file for uploading
	f, err := os.OpenFile(t.Path, os.O_RDONLY, 0644)
	if err != nil {
		return errors.Wrap(err, "tus upload")
	}
	defer f.Close()

	// Upload-Offset=0 means start from scratch, but still send PATCH
	if offset == 0 {
		tracerx.Printf("xfer: tus.io uploading %q from start", t.Object.Oid)
	} else {
		tracerx.Printf("xfer: tus.io resuming upload %q from %d", t.Object.Oid, offset)
		advanceCallbackProgress(cb, t, offset)
		_, err := f.Seek(offset, os.SEEK_CUR)
		if err != nil {
			return errors.Wrap(err, "tus upload")
		}
	}

	// 2. Send PATCH request with byte start point (even if 0) in Upload-Offset
	//    Response status must be 204
	//    Response Upload-Offset must be request Upload-Offset plus sent bytes
	//    Response may include Upload-Expires header in which case check not passed

	tracerx.Printf("xfer: sending tus.io PATCH request for %q", t.Object.Oid)
	req, err = httputil.NewHttpRequest("PATCH", rel.Href, rel.Header)
	if err != nil {
		return err
	}
	req.Header.Set("Tus-Resumable", TusVersion)
	req.Header.Set("Upload-Offset", strconv.FormatInt(offset, 10))
	req.Header.Set("Content-Type", "application/offset+octet-stream")
	req.Header.Set("Content-Length", strconv.FormatInt(t.Object.Size-offset, 10))
	req.ContentLength = t.Object.Size - offset

	// Ensure progress callbacks made while uploading
	// Wrap callback to give name context
	ccb := func(totalSize int64, readSoFar int64, readSinceLast int) error {
		if cb != nil {
			return cb(t.Name, totalSize, readSoFar, readSinceLast)
		}
		return nil
	}
	var reader io.Reader
	reader = &progress.CallbackReader{
		C:         ccb,
		TotalSize: t.Object.Size,
		Reader:    f,
	}

	// Signal auth was ok on first read; this frees up other workers to start
	if authOkFunc != nil {
		reader = newStartCallbackReader(reader, func(*startCallbackReader) {
			authOkFunc()
		})
	}

	req.Body = ioutil.NopCloser(reader)

	res, err = httputil.DoHttpRequest(config.Config, req, false)
	if err != nil {
		return errors.NewRetriableError(err)
	}
	httputil.LogTransfer(config.Config, "lfs.data.upload", res)

	// A status code of 403 likely means that an authentication token for the
	// upload has expired. This can be safely retried.
	if res.StatusCode == 403 {
		err = errors.New("http: received status 403")
		return errors.NewRetriableError(err)
	}

	if res.StatusCode > 299 {
		return errors.Wrapf(nil, "Invalid status for %s: %d", httputil.TraceHttpReq(req), res.StatusCode)
	}

	io.Copy(ioutil.Discard, res.Body)
	res.Body.Close()

	return api.VerifyUpload(config.Config, t.Object)
}